mineral
Quartz with Epidote
Silicon dioxide (SiO2) with Calcium aluminum iron silicate (Ca2Al2(Fe3+;Al)(SiO4)(Si2O7)O(OH))
Hardness 7 (quartz), 6-7 (epidote). Color: White/clear with pistachio green crust or inclusions. Luster: Vitreous. Crystal structure: Trigonal (quartz), Monoclinic (epidote).
- Color
- White/clear with pistachio green crust or inclusions
- Luster
- Vitreous
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Physical properties
Hardness 7 (quartz), 6-7 (epidote). Color: White/clear with pistachio green crust or inclusions. Luster: Vitreous. Crystal structure: Trigonal (quartz), Monoclinic (epidote).
Formation & geological history
Forms in hydrothermal veins, contact metamorphic zones, and altered igneous rocks.
Uses & applications
Primarily a collector's specimen. Sometimes used in lapidary arts if massive or heavily included.
Geological facts
Epidote is often associated with quartz and can form a thin greenish coating or distinct crystals on the quartz surface.
Field identification & locations
Identify by the contrast of the hard, glassy quartz with the distinct pistachio-green color of the epidote coating or inclusions. Commonly found in metamorphic terrains.
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